CVE-2006-2607 Jobs start from root when pam

用户报告在设置cron进程数量限制后，超过限制的新进程会以root身份运行。通过修改limits.conf和pam.d/crond配置文件尝试将进程数限制为10个，但超出的进程却显示为root所有。

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https://bugzilla.redhat.com/show_bug.cgi?id=178431

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Description of problem:
I set hard nproc limit in limits.conf to 10 and uncommented "session required
pam_limits.so" in /etc/pam.d/crond
When process limit have reached new processes start from root.

Version-Release number of selected component (if applicable):
vixie-cron-4.1-36.FC4 pam-0.79-9.6

How reproducible:
Always

Steps to Reproduce:
1. Add "username hard nproc 10" to /etc/security/limits.conf
2. Uncomment line with pam_limits.so in /etc/pam.d/crond
3. Add jobs in username crontab:
* * * * * /path/to/script.pl
script.pl:
#!/usr/bin/perl

open file, '>/path/to/pid.'.$$;
close file;
while(1) { sleep(1); }

Actual Results: After some time "ps aux" shows 10 process of script.pl under the user username
but other processes are under root.
10 pidfiles owned by username:usergroup but others by root:usergroup

Expected Results: 10 processes of script.pl under username

Additional info:

Also applied to FC3